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CVE-2026-64530 is a use-after-free vulnerability in the Linux kernel traffic-control subsystem caused by missing handling of TC_ACT_CONSUMED in tcf_qevent_handle(). The classifier tcf_classify() can return this action when connection-tracking defragmentation takes ownership of a socket buffer while processing out-of-order fragments. The vulnerable handler instead returns the buffer to its caller as though classification succeeded. RED queue-event processing can subsequently enqueue, drop, or update statistics using a buffer it no longer owns, resulting in use-after-free. Affected paths include RED mark and early-drop queue events.
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73 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in Linux kernel traffic-control handling. When connection-tracking defragmentation consumes an out-of-order fragmented packet, tcf_qevent_handle() incorrectly returns the packet buffer to the RED queue discipline, which continues operating on memory it no longer owns. The fix handles TC_ACT_CONSUMED by returning NULL without touching or freeing the buffer. The reference assigns a CVSS v3 base score of 9.8, although vendor severity is LOW.
A use-after-free vulnerability in Linux kernel traffic-control handling. When classification returns TC_ACT_CONSUMED during packet defragmentation, tcf_qevent_handle() incorrectly returns a packet buffer it no longer owns, allowing the RED queuing discipline to continue accessing it. The fix returns NULL without touching or freeing the consumed buffer. The advisory lists a CVSS v3 base score of 9.8, although vendor severity is LOW. Affected Google kernel packages should be updated to version 18613.675.37 or later.
A Linux kernel network-scheduler use-after-free vulnerability caused by missing handling of TC_ACT_CONSUMED in tcf_qevent_handle(), affecting Rocky Linux 9 kernel packages.
A Linux kernel traffic-control scheduler/classifier flaw involving handling of TC_ACT_CONSUMED in tcf_qevent_handle(). The advisory also describes it as a use-after-free condition caused by a missing handler. It affects packages installed on the Rocky Linux 8 host covered by CIQ advisory crlsa-2026_49213.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.